Nothing wrong with feeding on rats. It works. And that´s ok when theres no good hunting ground for humans.
I´ve calculated that about 20 rats equals one human. But draining a human that much will probably kill her. And that I won´t do. Problem with rats is it takes time catching them. Sneaky little bastards. I´m thinking of setting up a lab with rats as heard. A good snack bar.
But eventually I´ll have to find better ways of hunting. Human blood is of better taste and quality. But how to minimalise the suffering, to not make the prey getting hurt?